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zlib (rb_gzreader_getc): localize and return cbuf directly

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No point in having a long-lived cbuf in "struct gzfile"
since GZFILE_CBUF_CAPA is smaller than RSTRING_EMBED_LEN_MAX
(even on 32-bit).  We can also have rb_econv_convert write
directly to the return value instead of an intermediate buffer.

This brings "struct gzfile" from 264 to 256 bytes on 64-bit
systems to avoid taking an additional cache line.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63993 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-07-18 08:16:18 +00:00
parent f705c52908
commit a22232cd93
1 changed files with 6 additions and 20 deletions
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26
ext/zlib/zlib.c
View file

@ -2225,7 +2225,6 @@ struct gzfile {
rb_encoding *enc2;
rb_econv_t *ec;
VALUE ecopts;
char *cbuf;
VALUE path;
};
#define GZFILE_CBUF_CAPA 10
@ -2275,22 +2274,13 @@ gzfile_free(void *p)
}
zstream_finalize(z);
}
if (gz->cbuf) {
xfree(gz->cbuf);
}
xfree(gz);
}
static size_t
gzfile_memsize(const void *p)
{
const struct gzfile *gz = p;
size_t size = sizeof(struct gzfile);
if (gz->cbuf)
size += GZFILE_CBUF_CAPA;
return size;
return sizeof(struct gzfile);
}
static const rb_data_type_t gzfile_data_type = {
@ -2319,7 +2309,6 @@ gzfile_init(struct gzfile *gz, const struct zstream_funcs *funcs, void (*endfunc
gz->ec = NULL;
gz->ecflags = 0;
gz->ecopts = Qnil;
gz->cbuf = 0;
gz->path = Qnil;
}
@ -2870,22 +2859,19 @@ gzfile_getc(struct gzfile *gz)
if (gz->ec && rb_enc_dummy_p(gz->enc2)) {
const unsigned char *ss, *sp, *se;
unsigned char *ds, *dp, *de;
VALUE cbuf = rb_enc_str_new(0, GZFILE_CBUF_CAPA, gz->enc);
if (!gz->cbuf) {
gz->cbuf = ALLOC_N(char, GZFILE_CBUF_CAPA);
}
ss = sp = (const unsigned char*)RSTRING_PTR(gz->z.buf);
se = sp + ZSTREAM_BUF_FILLED(&gz->z);
ds = dp = (unsigned char *)gz->cbuf;
ds = dp = (unsigned char *)RSTRING_PTR(cbuf);
de = (unsigned char *)ds + GZFILE_CBUF_CAPA;
(void)rb_econv_convert(gz->ec, &sp, se, &dp, de, ECONV_PARTIAL_INPUT|ECONV_AFTER_OUTPUT);
rb_econv_check_error(gz->ec);
dst = zstream_shift_buffer(&gz->z, sp - ss);
gzfile_calc_crc(gz, dst);
dst = rb_str_new(gz->cbuf, dp - ds);
rb_enc_associate(dst, gz->enc);
OBJ_TAINT(dst);
return dst;
rb_str_resize(cbuf, dp - ds);
OBJ_TAINT(cbuf);
return cbuf;
}
else {
buf = gz->z.buf;